Scientific name: 
Octopus dofleini
Distinctive features: 
Size distinguishes giant Pacific octopus from small fist-sized red octopus.
Size: 
max. 10 ft. arm spread
Reddish brown coloration can vary with background. 8 suction cup-filled arms are 3-5 times the length of the body. Look for a pile of discarded shells to find the opening to a den.